问题
选择题
农民常将玉米和大豆轮作，这样做的好处是[ ]
A．大豆根部的很多根瘤菌可提高土壤肥力，使玉米可以充分利用
B．利用大豆压制杂草的生长
C．充分利用土地，提高产量
D．缓解人均耕地过少的矛盾
答案
答案：A
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农民常将玉米和大豆轮作，这样做的好处是[ ]
A．大豆根部的很多根瘤菌可提高土壤肥力，使玉米可以充分利用
B．利用大豆压制杂草的生长
C．充分利用土地，提高产量
D．缓解人均耕地过少的矛盾
答案：A
| 完形填空。 | |||
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